Roads up north are typically worse due to the freeze-thaw cycles. It just destroys them. Down south, you don’t have that so the roads last longer. Also, states like PA Suffer from mine subsidence in many areas which can cause road problems in some areas. And the northeast has higher population density and therefore more lane miles. So the larger highway systems require more maintenance.
Someone mentioned the high gas tax in PA. A very large portion of the gas tax is sucked up to fund the PA State Police pension fund, rather than improving roads and bridges. And while it is true, PA has high gas tax, we also do not have personal property tax on vehicles like other states such as WV. So that makes it hard to compare apples to apples when looking at state vs state taxes.